Automatic window lock



Sept. 5, 1933. GOQDRICH 1,925,244

AUTOMATIC WINDOW LOCK Filed Feb. 11, 1933 INVENT )h. Eamon 0 T dooo/wc/x km, M v

ATTORNEYS.

Patented Sept. 5, 1933 UNITED STATES a'rN OFFICE 1,925,244 p Q N AUTOMATIC WINDOW LooK I Edmond T. Goodrich, Detroit, Mich.

Application February 11, 1933. Serial No. 656,216

3 Claims.

This invention relates to an automatic window lock and has to do particularly with that type of lock for normally limiting the movement of a window sash.

Heretofore various types of locks have been used, which, when actuated or manually positioned, limit the movement of a window. In most of these prior art devices it is usually necessary to cut away or otherwise fabricate either a part of the window sash or a part of the frame.

It is the object of the present invention to provide an extremely simple and eiiicacious unit which may be readily attached to a part of the window frame, preferably the inside stop, and which will automatically, by its own inherent construction, move into locking position to permit only a predetermined movement of the window sash. More specifically, the present invention embodies a lock or stop unit adapted to be pivotally connected to the inside stop of the window frame and out of the vertical plane of movement of the window sash, but a portion of which because of certain counterweighting construction will be normally projected into the plane of the window sash.

Other features embody details of construction as will be more clearly set forth in the claims.

In the drawing:

Fig. 1 is a vertical sectional view of a standard window frame and window sash unit andillustrating the preferred manner of positioning my novel stop or lock unit relative to the lower window sash.

Fig. 2 is a fragmentary elevation showing the preferred manner of mounting the lock or stop to the inside stop of the frame.

Fig. 3 is a perspective view of a slightly modified form of my novel lock unit, which may be used in connection with either window sash.

Fig. 4 is a fragmentary view illustrating a slighty modified form of the lock unit, where an additional means is provided for maintaining the lock unit in fixed position, and illustrating the preferred embodiment.

In illustrating my invention I have shown same as being used in connection with a standard window frame of the double hung type, wherein the upper window sash 2 and the lower window sash 3 are guided in their upward and downward 50L movement by three members, namely, a blind stop or reveal 4, a parting stop 5, and an inside stop or garnish molding 6. 7

My window lock or stop unit is best illustrated in Fig. 3 and may be generally designated '7.

This unit '7 is preferably provided with an aperture 8 through which the unitis pivotally mounted by means of a screw 9 to the inside stop, as. best shown in Figs. 1 and 2. This lock member '7 preferably consists of an arm portion 10, a contacting or stop surface 11, and a counterweight 12 having a curved portion 13.

This lock member 7 may consist of a simple, relatively thin stamping, and because of the counterweighted portion 12 the arm 10 will normally be positioned at an angle when the arm is freely hung by the pivot 9,'as shown in Fig. 1. The mass of the counterweight will obviously determine the normal angle with which the arm 10 hangs with respect to the vertical.

When the lower sash 3 is in its normal, closed and lowermost position, the lock member 7 will hang in the position shown in solid lines in Fig. 1. When the window sash 3 is raised, either from the inside or from the outside the upper member of the sash 3 will contact with the fiat surface 11 of the lock members, which contact will limit the upward movement of the window sash 3. The outwardly-inclined and curved surfaces 13 will effectively prevent movement of the stop 7 by the insertion of wire or any other means through the bottom of the window sash in an attempt to dislocate the lock member. In other words, the more that a person from the outside would push upwardly against the surface 13 by means of a Wire or other member, the more firmly would the member '7 be locked into position. To raise the window higher from the inside, it is only necessary to grasp the counterweighted portion 12 and swing the member 7 inwardly.

In its preferred use, the member 7 is adapted .to be automatically positioned relative to the lower window sash 3 and to only normally limit the upward movement thereof. It will be obvious that my stop with the counterweighted principle can also be utilized to limit the lowering of the upper window sash. To accomplish this the member 7 will preferably have an extension 14, which may be normally positioned to contact with the lower surface of the upper member of the window sash 2.

In the modification shown in Fig. 4, the aperture of the lock 7 is shown provided with a keyway 15 and the fastening means 16 is preferably provided with a small key projection, whereby when the lock member 7 is contacted from the bottom by the window'sash 3, the key will fit Within the keyway to prevent lateral or oscillating movement of the lock member.

What I claim is:

1. A one piece lock member for limiting the opening movement of a window sash, comprising an arm pivotally mounted adjacent one end to a stop guide for the window sash said pivotal mounting being outside the normal plane of movement of the window sash, and a counterweight adjacent the other end of said arm for normally projecting the lower end of said arm within the plane of movement of said window sash, said lower end of the arm being shaped to contact directly with said window sash to prevent any further opening of the window and torigidly hold the lock in position if pressure is applied to force the window to a wider open position.

2. A look member for limiting the movement of a window sash, comprising an arm pivotally' mounted adjacent one end to a stop guide for the window sash, said pivotal mounting being outside the normal plane of movement of the window sash, and a counterweight adjacent the other end of said arm for normally projecting the lower end of said arm within the plane of movement of said window sash, said arm being normally positioned at an angle to the vertical by said counterweight, a portion of the arm opposite the pivotal mounting, terminating in a substantially horizontal surface adapted to contact and limit the movement of the window sash, the

combination of said substantially horizontal surface, angular arm, and pivotal mounting serving to more rigidly hold the lock in position if pressure is applied to force the window to a wider open position.

3. A lo member for limiting the movement of a window sash, comprising an arm pivotally mounted adjacent one end to a stop guide for the window sash, said pivotal mounting being outside the normal plane of movement of the window sash, and a counterweight adjacent the other end of said arm for normally projecting the lower end of said arm within the plane of movementv of said window sash, said arm being normally positioned at an angle to the vertical by said counterweight, a portion of the arm opposite the pivotal mounting terminating in a substantially horizontal surface adapted to contact and limit the movement of the window sash, the

combination of said substantially horizontal surface, angular arm, and pivotal mounting serving to more rigidly hold the lock in position if pressure is applied to force the window to a wider open position, said counterweighted portion projecting' inwardly and upwardly from said substantially horizontal surface.

I EDMOND T. GOODRICH. 

